# Ontario Grade 4 Science and Technology — 9 November 2026

This dependent proposal reviews all **55 retained codes: 44 specific and 11 overall**.
It is based on the unmerged Grade 3 proposal at
`0db84b28b1b2038d934866630be2ec478ca1957a`, including the prior reviewed Grade 1/2
components. The exact dependency and every code disposition are retained in the
[code-by-code mapping](ontario-grade4-science-mapping-2026-11-09.json).
This is a repository proposal, not accepted-main or deployed state.

## Outcome

| Scope | Full semantic support | Partial | New topics proposed |
| --- | ---: | ---: | ---: |
| 44 specific expectations | 17 | 27 | 0 |
| 11 overall expectations | 0 | 11 | 0 |

The proposal adds **84 distinct pairs across 42 codes and 58 existing topics**,
in 58 new Canada/Ontario **9–10** contexts. All prior intervals and associations
are preserved. No global start age is lowered; no topic identity, authored claim,
assessment, dependency or research meaning changes.

Full is an authoring source-fit judgment, not learner mastery, teaching delivered
or consumer eligibility. Components can contribute to an expectation that remains
Partial. Missing resources, incomplete practical demonstrations or candidate-only
later claims are not automatic new-topic requests. Overall judgments are made
independently rather than derived from counts of child links.

## Source and exact review

The [official Grade 4 expectations PDF](https://assets-us-01.kc-usercontent.com/fbd574c4-da36-0066-a0c5-849ffb2de96e/885f1ebf-50ff-4a6c-8866-96dba4afbf09/SciTech_G4_AODA.pdf)
was retrieved 9 November 2026, SHA-256
`1283454f582f5d80badcc0bd8715678e7b93e3527cf18106e1703072a7900d2a`.
All five pages were read. The
[full 2022 curriculum](https://assets-us-01.kc-usercontent.com/fbd574c4-da36-0066-a0c5-849ffb2de96e/36038265-bd6d-4991-882b-52b4b06c32d0/The%20Ontario%20Curriculum%20Grades%201%E2%80%938%20%E2%80%93%20Science%20and%20Technology%202022_2.pdf),
SHA-256 `1ade9235dcacf15c27dcc92328d1f883c3026c1687bf40368448b39ec6e4bd74`,
provides process context on printed pages 69–80 and Grade 4 on 124–134. All
44 specific paragraphs independently match between the two official sources,
excluding the extracted publisher copyright footer only.

Searches span all subjects/domains and inspect whole descriptions, evidence,
assessment and prerequisites. Public artifacts retain source keys and our review
judgments, without restricted expectation wording or source PDFs.

## Existing-topic decisions

- **Ecology:** existing habitat provisions, food-chain roles, diagram reading,
  animal diets and plant/animal features supply actual knowledge. Species-removal
  predictions combine with existing threat/protection explanations. No separate
  Ontario food-chain, diet or adaptation progression is introduced.
- **Web operations:** interpreting a supplied web already traces shared organisms
  and several chains. A later claim additionally constructs webs from data.
  The operation difference matters; the later construction requirement is not
  imposed on this earlier expectation, and no full claim is lowered.
- **Light/sound:** existing light sources plus biological emission supply the
  object/living distinction. Material tests, medium propagation, reflection,
  vibration, pitch and volume are real contributions. Vocabulary alone does not
  certify every absorption, straight-path or wave explanation. Later ray-diagram
  and pressure-wave claims remain candidate-only.
- **Cross-subject devices:** existing computer components already name cameras,
  microphones, screens and speakers and choose them for a purpose. Combined with
  senses/eye claims, these supply sensory/device cases without a new topic.
- **Environmental effects:** the insect-conservation claim explicitly describes
  artificial-light disruption. It contributes directly, while sound cases and
  relevant perspectives remain conditions. A generic pollution link is not
  substituted for a checked effect.
- **Mechanisms:** the existing lever/pulley/gear claim directly explains force
  changes and everyday uses. It does not automatically prove every part, rotary
  transfer or geometric-plane transformation. Those conditions remain explicit;
  no new mechanism claims are requested in this batch.
- **Rock cycle:** an existing complete claim traces transformations and geological
  time. Its actual assessed operation matches the source. A parallel existing
  record substantially overlaps that operation; it is recorded for later identity
  review, with both IDs unchanged. Age labels do not justify separate claims.
- **Fossils:** formation and interpretation of fossil evidence are different
  contributions. A related strata/landscape inference record is not treated as
  equivalent merely because its title also mentions fossil formation.
  Separately, the existing formation claims `mt_mwirOvigWD` and
  `mt_iycQEai3dK` have possible overlap requiring a later identity review.
  They are unchanged; no equivalence, retirement or learner-state transfer is
  inferred by this alignment pass.
- **Community knowledge:** general mineral properties and use examples are
  available, but do not establish geological knowledge held by First Nations, Métis and Inuit
  communities. Checked community sources and knowledge/purpose connections remain
  necessary; Australian cases are not relabelled.

## Source-fit task boundaries

These checks describe proposed review tasks, not observations of learners or
canonical assessment edits.

| Codes | Positive case | Near miss to reject | Transfer check |
| --- | --- | --- | --- |
| B2.4 | Trace two chains through a supplied web and explain a shared organism. | A chain with only one route is called a web. | Trace another route and predict a stated removal. |
| C2.2 | Distinguish a glowing organism and a reflective object using actual light production. | Any visible living thing is said to emit light. | Explain a different biological source versus reflected illumination. |
| D2.5 | Explain how existing lever, pulley and gear examples change force effects. | Name a machine without relating its mechanism to force. | Apply the same reasoning to another appropriate example. |
| E2.1 | Trace a complete rock transformation route and explain its processes. | Recite three type names as though names alone form a cycle. | Explain a different valid transition through the same processes. |
| E2.5 | Relate preservation to an inference about a former environment. | A model imprint is treated as proof of the complete real formation process. | Interpret a different fossil/environment case with stated evidence. |

## Code-by-code overview

`C` denotes a direct component and `W` a whole-expectation contribution. Detailed
conditions, prerequisites and candidates are in the JSON. A blank holder is a
reviewed condition, not permission to create a topic.

| Code | Semantic judgment | Direct topic IDs and roles |
| --- | --- | --- |
| A1 | Partial | Child reviews |
| A1.1 | Partial | `mt_XirhnAB6Ye` (C); `mt_4A4RpX-Go9` (C); `mt_vJO5Bxk4z-` (C); `mt_7VrR1GzhrN` (C) |
| A1.2 | Partial | `mt_XirhnAB6Ye` (C); `mt_MRQcEvyPJv` (C); `mt_Wa44s-f8Ws` (C); `mt_ZFwPZaDJ0_` (C); `mt_7VrR1GzhrN` (C) |
| A1.3 | Partial | `mt_hi8cVycbwn` (C); `mt_FtCLISvSGw` (C); `mt_RlILL2sccX` (C); `mt_nNYo5A-7Bl` (C) |
| A1.4 | Partial | `mt_TTH2ouwyTW` (C); `mt_FtCLISvSGw` (C) |
| A1.5 | Partial | `mt_7VrR1GzhrN` (C); `mt_o8ciHks8t2` (C); `mt_NP101Zl-4g` (C) |
| A2 | Partial | Child reviews |
| A2.1 | Partial | `mt_sPV503BQnI` (C) |
| A2.2 | Partial | `mt_AzTrT5ySCx` (C) |
| A3 | Partial | Child reviews |
| A3.1 | Full | `mt_Q2Zj3L8u9C` (C); `mt_rTn43s8RNX` (C) |
| A3.2 | Partial | `mt_RlILL2sccX` (C); `mt_4A4RpX-Go9` (C) |
| A3.3 | Partial | — |
| B1 | Partial | Child reviews |
| B1.1 | Partial | `mt_deexfCHU9m` (C); `mt_7e-lG7YOWa` (C) |
| B1.2 | Full | `mt_uVaS12lN1i` (C); `mt_5S4byWDX6n` (C); `mt_pWwV_8OgXD` (C) |
| B2 | Partial | Child reviews |
| B2.1 | Full | `mt_cM8YS6NXqi` (W) |
| B2.2 | Partial | `mt_cM8YS6NXqi` (C); `mt_lutxvMlkwS` (C) |
| B2.3 | Full | `mt_oB-L8EVdIP` (C); `mt_M7XhBBzYof` (C) |
| B2.4 | Full | `mt_uVaS12lN1i` (W) |
| B2.5 | Full | `mt_13CtLTcWUB` (W) |
| B2.6 | Full | `mt_LRzjbo1Fn6` (C); `mt_Wx5m6mwkpj` (C) |
| B2.7 | Partial | `mt_cM8YS6NXqi` (C); `mt_lutxvMlkwS` (C) |
| C1 | Partial | Child reviews |
| C1.1 | Partial | `mt_ZL9qVVnpwN` (C) |
| C1.2 | Partial | `mt__EL7DHjf5R` (C) |
| C2 | Partial | Child reviews |
| C2.1 | Full | `mt_4i-FKXDDXh` (W) |
| C2.2 | Full | `mt_4i-FKXDDXh` (C); `mt_dRCnJEIwk4` (C) |
| C2.3 | Partial | `mt_gLy3ZgZWiN` (C); `mt_SFOSbVnrJ8` (C) |
| C2.4 | Partial | `mt_ydtcIBwHB9` (C); `mt_SFOSbVnrJ8` (C); `mt_KTSoXcO7OL` (C); `mt__00ZSLnB7p` (C) |
| C2.5 | Partial | `mt_VBl1T1sFCM` (C); `mt_ydtcIBwHB9` (C) |
| C2.6 | Full | `mt_p6frRFuxS6` (C); `mt_gLy3ZgZWiN` (C); `mt_ydtcIBwHB9` (C) |
| C2.7 | Partial | `mt_PiWZA8Z0ZJ` (C); `mt_akBotspaf2` (C) |
| C2.8 | Full | `mt_nwSWPTENmv` (C); `mt_-gkJdxJUQT` (C); `mt_o0vTMl8vj5` (C) |
| D1 | Partial | Child reviews |
| D1.1 | Partial | `mt_Q2k3fSwyzQ` (C); `mt_Q2Zj3L8u9C` (C) |
| D1.2 | Partial | `mt_cOJhDeLkPo` (C); `mt_VI5kdtf28e` (C) |
| D2 | Partial | Child reviews |
| D2.1 | Full | `mt_Q2k3fSwyzQ` (W) |
| D2.2 | Partial | `mt_Q2k3fSwyzQ` (C) |
| D2.3 | Partial | `mt_Q2k3fSwyzQ` (C) |
| D2.4 | Partial | `mt_Q2k3fSwyzQ` (C) |
| D2.5 | Full | `mt_Q2k3fSwyzQ` (W) |
| E1 | Partial | Child reviews |
| E1.1 | Partial | `mt_NVr4AhsvIq` (C); `mt_yDZbQODIwp` (C); `mt_m6UaSmrQVG` (C) |
| E1.2 | Partial | `mt_wH4t4TH0Yw` (C); `mt_VI5kdtf28e` (C); `mt_deexfCHU9m` (C) |
| E2 | Partial | Child reviews |
| E2.1 | Full | `mt_z7AJZapsJj` (W) |
| E2.2 | Full | `mt_R6YoRXkRxS` (C); `mt_NYA50DFcOO` (C) |
| E2.3 | Partial | `mt_R6YoRXkRxS` (C); `mt_wH4t4TH0Yw` (C) |
| E2.4 | Full | `mt_wH4t4TH0Yw` (W) |
| E2.5 | Full | `mt_mwirOvigWD` (C); `mt_6Z42wJaKYG` (C) |
| E2.6 | Partial | — |

## Remaining conditions and validation

Community definitions and habitat limits, complete optical/acoustic property
accounts, low-heat light contrasts, mechanism component/kinematic accounts,
composition classification, culturally verified geological knowledge and complete
impact/perspective cases remain explicit. No forced association resolves them.

The diagnostic lists **59 distinct hard-prerequisite IDs** without an
explicit Ontario context spanning 9–10. This is not a consumer selection rule.
Global/framework guidance and consumer behavior need separate review; a missing
Ontario prerequisite interval does not erase semantic contribution. No invented
source link, age-only record or dependency change clears the diagnostic.

Public validation and generated-artifact checks pass. Exact checks preserve all
prior contexts and Grade 1–3 reports, topic identities, authored fields, dependency,
catalogue, cluster and archived research data. Generated compatibility fields and
research bindings change only as required by the associations. The source-text
screen and report-link checks pass; no official wording is redistributed.

This proposal includes no DB or learner writes and no deployment receipt. Reconcile
the unmerged dependency with accepted content before downstream handoff. Ontario
Science alignment is not declared complete by this grade review.